Upstreamings parts of webkit.gyp (step 1)

Upstreamings parts of webkit.gyp (step 1)

This is step 1 a multi-step process that is part of the webkit chromium port. 

This step includes:
A. Refactoring the wtf, pcre & webcore targets into separate files javascriptcore.gypi and webcore.gyp, which would eventually move upstream.
B. Refactoring the feature_define variables into features.gypi, to allow two sets of feature defines - one for chromium port and one for chromium.
C. Refactoring the config target into config.gyp, since currently both javascriptcore and webcore target depend on it.

Next steps:
2. Eliminate config dependency.
3. Make features.gypi only override built-in variables that live upstream (so we don't have to maintain 2 parallel feature lists).
4. Really move webcore.gyp & javascriptcore.gyp to webkit.org

Committed: http://src.chromium.org/viewvc/chrome/trunk/26584

[yaar, 2009-09-17 00:32:19]

Mark, this is only the 1st step of what we decided to do. I like keeping the
changes small.

[Mark Mentovai, 2009-09-17 17:56:25]

LG

http://codereview.chromium.org/212003/diff/1/2
File webkit/config.gyp (right):

http://codereview.chromium.org/212003/diff/1/2#newcode1
Line 1: # Copyright (c) 2009 The Chromium Authors. All rights reserved.
Remember to do a follow-up to set svn:eol-style if you're using git and it
doesn't set it for you.

http://codereview.chromium.org/212003/diff/1/4
File webkit/javascriptcore.gyp (right):

http://codereview.chromium.org/212003/diff/1/4#newcode70
Line 70: 'defines': ['WTF_USE_PTHREADS=1'],
Is this something that we want in features.gypi?

http://codereview.chromium.org/212003/diff/1/7
File webkit/webkit.gyp (right):

http://codereview.chromium.org/212003/diff/1/7#newcode7
Line 7: '../third_party/WebKit/WebCore/WebCore.gypi',
Is that a space at the end of the line?  Presubmit will hate that.

I don't know if there's a way to make presubmit run automatically when you're
using git.